Final answer:
Furosemide (Lasix) is a loop diuretic used to treat hypertension by inhibiting the reabsorption of sodium and chloride in the loop of Henle, which increases urination and reduces blood volume. It is not typically used to treat hypotension; the patient with low blood pressure and dehydration symptoms would need intravenous fluids.
Step-by-step explanation:
A patient presenting with a blood pressure reading of 70/45 mmHg, confusion, and complaints of thirst is likely experiencing signs of hypotension and dehydration. The administration of furosemide (Lasix), which is a type of loop diuretic, is intended to treat hypertension, not hypotension. Loop diuretics act on the ascending limb of the loop of Henle in the kidneys, inhibiting the reabsorption of sodium (Na+) and chloride (Cl−) ions. This action leads to increased excretion of water, which in turn reduces blood volume and blood pressure. As such, using a diuretic like furosemide to treat hypotension would not be appropriate. Instead, the patient likely requires fluid resuscitation, possibly with an intravenous saline solution, to address dehydration and elevate blood pressure.